1.eucalyptus

Eucalyptus Dried / fresh leaves of Eucalyptus globulus Myrtaceae Known as Blue Gum Tree Both young & old leaves are used for volatile oil extraction Only old leaves are used for making Eucalyptus leaves

Young leaves leaves

Ovate,cordate at base ,

Old

Scimitar shape,short & twisted petioles

Description 

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Shape apex Lamina dry Margin Midrib Petiole Surface

Odour fresh

Ensiform in outline with acute Thick , coriaceous , brittle when Entire , somewhat thickened Not prominent on either side Short & twisted Glabrous , but punctate Frequently marked with minute warty brown spots Strong camphoraceous when

Microscopy Isobilateral leaf

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Lamina Epidermis both upper & lower Thick cuticle Over each gland a small patch of modified cells present Stomata sunken , anomocytic Palisade 2 – 3 rows on each side Mesophyll ovoid schizogenous oil glands calcium oxalate crystals near fibers of veins in palisade & spongy tissue

Midrib 

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Epidermis continuous over midrib Collenchyma below upper & above lower epidermis Major portion occupied by vascular bundle surrounded by incomplete sheath of fibrous pericycle Xylem from different bundles together form a bow shaped structure having phloem on either side Calcium oxalate crystals are also seen

Constituents Volatile oil cineole  Tannin  Bitter principle  Resins 

Uses   

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Astringent Decongestant Relaxant in aroma therapy Used in asthma Nasopharyngeal infections Cough Soaps , perfumes Internally in the form of mixtures , inhalation , lozenges , pastilles